Power press



Aug. 19 1924. 1,505,655!) F. E. LAYMAN POWER PRESS Filed March 10 1919 4 Sheets-Sheet 1 A qINVENTOR. c wmk 6. wwvvv EZA ATTORNEY Aug. 19 ,'1924. 1,505,099

I F. E. LAYMAN POWER PRESS Filed March 10 1919 4 Sheets-Sheet 2 I 1 O, I, L I I! 44 55 J 23 20 43 32 Q e0 INVENTOR.

A TTORNEY Aug. '19 1924. 1,505,099

F. E. LAYM AN POWER PRESS Filed March 10 1919 4 Sheets-Sheet 3 Aug. 19 1924.

F. E. LAYMAN POWER PRESS 1919 4 Sheets-Sheet 4 Filed March 10 u no m. f

g INVENTOR. w

ATTORNEY Patented Aug. 19, 1924.

' STATES LSUiM-it) PATENT OFFICE.

FRANK E. LAYIVIAN, 0F MILWAIiKEE, wrs'ooivsriv, Assrcrivon, TO THricU'rLER-HAMMER MFG. 00., or MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

POWER rianss.

Application filed March 10, 19l9. Serial No. 281,703.

To all whom it may concern.

Be it known that I, FRANK E. LAYMAN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of l Visconsin, have invented new and useful Improvements in Power Presses, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

This invention relates to power presses and is particularly applicable to those utilized for pressing cold molded products, although presses embodying the invention may be advantageously employed for varione other purposes. In the development of an automatic press for cold molded products great difficulty has been experienced in designing suitable means for extracting the molded pieces fro-m the press due to the fact that the molded pieces tend to stick to their dies and to the further fact that in many instances the dies are of such design as to project into the molded piece, or vice versa.

The present invention has among its ob jects to provide for presses employed for the aforesaid and other purposes, simple, efficient and durable mechanism for extracting the pressed articles therefrom, such mechanism serving to grip and hold the articles While the die is disengaged therefrom.

Another object is to provide such an extracting mechanism which will function entirely automatically and without delaying successive operations of the press.

Another object is to provide an extracting mechanism which may be readily adjusted to meet different operating conditions.

Another object is to provide an extracting various modifications without departing from the scope of the appended claims.

In the drawing,

Figure 1 is a front elevation of the press;

Figs. 2 and 3 are plan views of the extracting and die filling mechanisms;

Figs. 4 to 6 inclusive are enlarged detail views of the extracting and die filling mechanisms;

Fig. 7 is an enlarged detail view of a part of the die lilling mechanism;

Fig. 8 is a side elevation of the press showing the operating means for the extracting and die filling mechanisms;

9 is an enlarged detail view of the control means for the die filling mechanism; and, v

Fig. 10 is a perspective view of a control drum associated with the press.

The press illustrated is in general of a well known hydraulic type comprising in brief, a bed 1, a platen 2, die holders 3 and 4: respectively mounted on said bed and platen, a hydraulic cyli'nderb for operating said platen against the action of return springs 6 and a spring operating mechanism 7 for normally retracting the lower die in its holder 8. The mechanism 7 is adapted to be operated through suitable connections by a shaft 8 to raise the lower die in its holder 3 and said shaft is operable by the platen 2 through the usual connections 9 to raise and trip the lower die upon elevation of the platen following each pressing operation. The cylinder 5 is adapted to be supplied with fluid through a control valve 10 connected thereto by a pipe 11 and said valve which is of a conventional design, is adapted upon oscillation by a lever 12 to provide for alteri'iately supplying and exhausting said cylinder. In practice the valve may be operated by hand or automaticallv as by a drum 13 driven by an electric motor 14-, said drum having cam plates 15 and 16 (Fig. 10) engaging a roller 17 on the valve operating lever to oscillate said lever upon continuous rotation of the drum.

Referring now to the extracting and die filling mechanisms (Figs. 2 and 3) there is secured to the lower die holder a plate 20 having an opening 21 therein registering with the die. This plate supports a segmental shaped slide 22 having adjacent to its forward end a through opening 23 adapted upon movement of said slide to be alterlll ' the material contained in opening 23 into the lower die. The slide has an operating lever 26 fulcrumed on .a support 27 provided on the bed 1 and said lever is operatively connected as hereinafter set forth, to the platen of the press to be automatically operated thereby. As will be understood the slide must be moved forwardly to till the die when the platen is raised and must be returned to the position shown in Fig. 2 when the platen is lowered and as will also be understood adjustments in the operating range of the platen necessitate adjustment of the range o't'movement of the slide. Such adjustments of the range of movement of the slide may be effectedby adjustment of the pivot of lever 26. As best shown in Fig. 6, the support 27 of lever 26 comprises an arm secured at one end to a boss on the press bed by a screw 28 and provided at its free end with a pivot stud 29 for said lever, said lever having a longitudinally adjustable bearing block through which said stud projects. Such block comprises rectangular sec tions and 31 fitting within a slot 32 provided in lever 26, said slot having ribbed walls and said block sections having oppositely beveled edges to grip the ribs of said Walls. Block 31 is provided with a threaded sleeve 33 extending through section 30 and carrying a nut 34 by means of which the sections may be clamped in place after adjustment in the slot.

The extracting mechanism includes a pair of relatively movable grippers 35 and 36, the gripper 36 being secured to one of a pair of opposed plungers 37 and 38 within a cylinder 39 (Fig. 4) and the gripper 35 being carried by a slide 4L0 mounted inan external groove ll in the cylinder wall and connected to the plunger 38. The cylinder is bolted to a bracket 42 (Fig. 5) pivotally secured to the lever 26 by a bolt 43 whereby said cylinder is supported by said lever and is permitted an oscillatory movement relative thereto. However, the bracket cooperates with lever 26 to limit said cylinder to a relatively slight oscillatory movement and a spring 44- is provided to normally hold the cylinder and lever in the relation shown in Fig. 4. Also, the plungers of the cylinder are respectively biased by springs 45 and 46 to normally hold the grippers 35 and 36 in the spaced relation shown in Fig. 4. On the other hand, the cylinder has a fluid inlet port 4-7 between the plungers and fluid entering the cylinder at this point tends to separate said plungers to draw the grippers 35 and 36 together. The grippers as shown comprise substantially rectangular blocks respectively provided with lface plates 48 and a9 removably secured thereto and shaped to conform with the shape oil the pieces to be handled. As illustrated, each of the plates l8 and ll) is provided with ii dowel pin 50 to project into its respective block and with a screw 51 to thread into its respective block.

In operation, when the lever 26 approaches the position shown in Fig. :5 the grippers are disposed on opposite sides o l the molded piece which at this time is raised by the lower die. Thus if fluid now be supplied to cylinder 39 the grippers will grasp and support the molded piece while the die is retracted to free said piece. in the mean-- time the gripper support will be restrained by engagement of the gripper with the molded piece whereby said support will be caused to rotate relatively to the lever 2o against the action of spring ll. .\ccordingly when the molded piece is freed .i'rom the die the spring will jerk the support back to normal relation with the lever and assunr ing the grippers to be now relieved of pres" sure the molded piece will be thrown from the grippers onto the inclined plate 52, (Fig. 1) for discharge into a suitable receptacle, not shown. As above stated, the extracting mechanism is moved automatically by the platen and as will appear, the fluid cylinder of said mechanism is also controlled automatically for the aforesaid operations of the grippers.

The operating mechanism for l he lever 20, which is best illustrated in Fig. 8, includes links 58 and 54 respectively connected to the bed and platen oi? the press and both connected through common media to said lever. The lever 26 has a ball extremity 5" fitting asocket 56 which is connected through a turn buckle 57 and ball and socket joint 58 to links 53 and 54. Thus the arrangement is such that as the platen lowered the bull end of lever 26 is moved forwardly to etiecl rearward movement of the slide 22 whereas when the platen is raised the lever is moved in a reverse direction to move the slide forwardly. Hence with the pivot block of lever 26 and the turn buckle 57 properly mljusted, the above described mechanisms will function as above set forth to receive a charge from the chute 24 during pressing operation, then move forwardly to extract the molded piece and fill the die as the platen is raised for the next pressing operation and finally return to normal position to permit the platen to again descend. Fur- Ill) llli

ther, said mechanisms will function to protect the dies should the lower die for any reason fail to return to normal position after elevation thereof. In such an event the lower die will arrest the lever 26 .which is connected to the ball through a readily breakable pin and when said lever is so arrested the gripper block 35 which has an upward extension 85 (Fig. 5) will co-operate with a pin 2 (Fig. 1) provided on the platen die to prevent the descent thereof.

The control means for the cylinder of the extracting mechanism, which is best illustrated in Figs. 6 and 9, includes a valve 61 fixed to the side of the press, said valve having a reciprocating plunger 62 coupled through a resilient connection 63 to a reciprocable rod 64 operable by the platen. More specifically the rod 64 has secured thereto at 65 a bar 66 slidingly fitting within a block 67 provided on the side of the platen, said bar having a catch 68 to be engaged with an edge of the block in a given relation of said rod and platen, such engagement being effected by a spring pressure device 69. Also,

the bar 66 is provided at its upper end with a beveled face 70 to engage an inclined stop 71 fixed to the press frame, for effecting re lease of said bar when the platen is raised to a given position. The arrangement is such that when the platen is lowered for a press ing operation the bar 66 catches on block 67 for elevation of said bar by the platen when the latter is raised, thus effecting a given operation of the valve 61 whereas when the platen is raised to a given position the bar 66 is tripped to release the valve and permit the same to ."return to tnormal posit-ion. Briefly described, the valve illustrated has a chamber 72 containing the plunger 62, said chamber having an intake 73, an outlet 74 adapted to be piped to the cylinder 39, an exhaust outlet 75 and seats 76 and 77 for said plunger surrounding the intake and exhaust ports. The plunger is biased by a spring 78 to close the intake port and to open the exhaust port to permit the cylinder to exhaust, whereas said plunger when connected to the platen is operable by the latter to close the exhaust port and open the intake port to supply the cylinder. Thus assuming proper adjustment of the aforesaid means, the valve will be operated automatically to effect and time the operations of the grippers as above described.

What 1 claim as new and desire to secure by Letters Patent is:

l. The combination with a press having a die part for projecting the pressed article, said die part having projecting and return movements during the return stroke of said press, of means for gripping the article upon projection thereof and for releasing the same upon a given return movement of said die part and means associated with said former means for throwing the article from said press immediately upon release there of by said former means. I

2. The combination with a press having a die part for projecting the pressed article, said die part having projecting and return movements during the return stroke of said press, of means operable automatically upon projection of the article to eject the same from the press, said means including a aevice for momentarily gripping and auton'lat-ically releasing the article during initial return,niovement of said die part.

3. The combination with a press having a die part for projecting thepressed article, said die part having projecting and return movements during the return stroke of said press, of. a mechanism for automatically ejecting the pressed article from said press including a device operable automatically to grip and support the pressed article during return movement of said die part, and also operable automatically to release the pressed article and simultaneously throw the same from said press.

1. The combination with a press having a die part for projecting the pressed article, said die part having projecting and return movements during the return stroke of said press, of a member operatively connected to said press to move in one direction during the forward stroke of said press and in an opposite direction during the return stroke thereof and a device carried by said member for gripping the pressed article upon projection thereof and for releasing the same upon a given return movement of said die. part, said device being adapted to move with respect to said member while holding the article.

5. The combination with a press having a die part for projecting the pressed article said die part having projecting and return movements during the return stroke of said press, of a power operated device for gripping the pressed article, said device being operatively connected to said press for movement in opposite directions during the forward and return strokes of the latter and control means operatively connected to said press to render said device operable to momentarily grip the pressed article during initial return movement of said die part.

6. The combination with a press having a die part for projecting the pressed articles, said 'die part having projecting and return movements during the return stroke of said press, of a power operated device for gripping the pressed articles, said device being operatively connected to said press for movement in opposite directions during the forward and return strokes of the latter. Control means operatively connected to said press to render said device operable to momentarily grip the pressed articles during initial return movement/of said die part and spring means associated with said device for throwing the pressed article from the press immediately upon release thereof by said device. g

7. The combination with a press having co-operating die parts of a member operativelyconnected to said'press for movement thereby "between said die parts during the return stroke of said press, a device carried by said member for gripping the pressed articles, said device having a play relative to said member and anenergy storing con nection between said device'andi said member whereby the former is adapted to throw the pressed article upon release thereof.

.8. The combination with a press having co-operating die parts of a member operativelyconnected to said press for movement thereby between said die parts during the return stroke of said press, a device carried by said member for gripping the pressed articles and means to effect gripping and releasing operations of said device in a given time relation with respect to certain operations of said press, said device having a play relative to said member and an energy storing connection between said device and said member to cause the former to eject the pressed articles upon releasing the same.

A mechanism for extracting from presses the articles operated upon thereby, including grippers, a fluid pressure cylinder having independently movable pistons supporting said grippers for movement thereof toward and away from one another and said pistons when subjected to the pres sure of fluid entering said cylinder being adapted to force said grippers toward one another and means biasing said pistons for separative movement of said grippers.

In witness whereof, I have hereunto subscribed my name.

FRANK E. LAYMAN. 

